已知实数a.b.x.y满足a b=x y=2,ax+by=5,则(a^2+b^2)xy+ab(x^2+y^2)=?
已知实数a、b、c、d满足a+b=x+y=2,ax+by=5.求(a²+b²)xy+ab(x
已知实数a,b,x,y满足a b=x y=2,ax by=5,则(a^2 b^2)xy ab(x^2 y^2)=?拜托了
已知实数A.B.X.Y.满足A+B=X+Y=2,AX+BY=5,则(A^2+B^2)*XY+AB(X^2+Y^2)=
1,已知a,b,x,y满足a+b=x+y=2,ax+by=5,则(a^2+b^2)xy+ab(x^2+y^2)=?
已知实数a、b、x、y满足a+b=x+y=2,ax+by=5,则(a2+b2)xy+ab(x2+y2)=______.
已知实数a,b,x,y满足ax+by=4,ay-bx=5,则(a^2+b^2)+(x^2+y^2)=
已知实数x,y,a,b,满足x^2+y^2=1,a^2+b^2=1,则ax+by的最大值是
已知实数x,y,a,b,满足x^2+y^2=1,a^2+b^2=3,则ax+by的最大值是
已知实数a、b、x、y满足a+b=x+y=2,ax+by=5,求ay+bx
设实数X,Y,A,B,满足X^2+Y^2=3,A^2+B^2=1,则AX+BY的最大值是?
设实数a.b.x.y满足a^2+ b^2=1,x^2 +y^2=3,则ax +by的最大值是多小
设实数a,b,x,y满足a^2+b^2=1,x^2+y^2=3,则ax+by的最大值( )